/**
 * @author alteredq / http://alteredqualia.com/
 * @author mr.doob / http://mrdoob.com/
 */

var Detector = {

        canvas: !! window.CanvasRenderingContext2D,
        webgl: ( function () { try { var canvas = document.createElement( 'canvas' ); return !! window.WebGLRenderingContext && ( canvas.getContext( 'webgl' ) || canvas.getContext( 'experimental-webgl' ) ); } catch( e ) { return false; } } )(),
        workers: !! window.Worker,
        fileapi: window.File && window.FileReader && window.FileList && window.Blob,

        getWebGLErrorMessage: function () {

                var element = document.createElement( 'div' );
                element.id = 'webgl-error-message';
                element.style.fontFamily = 'monospace';
                element.style.fontSize = '13px';
                element.style.fontWeight = 'normal';
                element.style.textAlign = 'center';
                element.style.background = '#fff';
                element.style.color = '#000';
                element.style.padding = '1.5em';
                element.style.width = '400px';
                element.style.margin = '5em auto 0';

                if ( ! this.webgl ) {

                        element.innerHTML = window.WebGLRenderingContext ? [
                                'Your graphics card does not seem to support <a href="http://khronos.org/webgl/wiki/Getting_a_WebGL_Implementation" style="color:#000">WebGL</a>.<br />',
                                'Find out how to get it <a href="http://get.webgl.org/" style="color:#000">here</a>.'
                        ].join( '\n' ) : [
                                'Your browser does not seem to support <a href="http://khronos.org/webgl/wiki/Getting_a_WebGL_Implementation" style="color:#000">WebGL</a>.<br/>',
                                'Find out how to get it <a href="http://get.webgl.org/" style="color:#000">here</a>.'
                        ].join( '\n' );

                }

                return element;

        },

        addGetWebGLMessage: function ( parameters ) {

                var parent, id, element;

                parameters = parameters || {};

                parent = parameters.parent !== undefined ? parameters.parent : document.body;
                id = parameters.id !== undefined ? parameters.id : 'oldie';

                element = Detector.getWebGLErrorMessage();
                element.id = id;

                parent.appendChild( element );

        }

};